﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CommonConsoleApp
{
    //http://stackoverflow.com/questions/2231796/heap-class-in-net
    class SortedDictionaryAsBinaryHeap
    {
        private static Boolean _enableCompareCount = false;
        private static Int32 _compareCount = 0;

        public static void Run(string[] args)
        {
            var rnd = new Random();

            for (int elementCount = 2; elementCount <= 6; elementCount++)
            {
                var keyValues = Enumerable.Range(0, (Int32)Math.Pow(10, elementCount))
                    .Select(i => new HeapKey(Guid.NewGuid(), rnd.Next(0, 10)))
                    .ToDictionary(k => k);
                var heap = new SortedDictionary<HeapKey, HeapKey>(keyValues);

                _compareCount = 0;
                _enableCompareCount = true;
                var min = heap.First().Key;
                _enableCompareCount = false;
                Console.WriteLine("Element count: {0}; Compare count for getMinElement: {1}",
                                  (Int32)Math.Pow(10, elementCount),
                                  _compareCount);

                _compareCount = 0;
                _enableCompareCount = true;
                heap.Remove(min);
                _enableCompareCount = false;
                Console.WriteLine("Element count: {0}; Compare count for deleteMinElement: {1}",
                                  (Int32)Math.Pow(10, elementCount),
                                  _compareCount);
            }

            Console.ReadKey();
        }

        private class HeapKey : IComparable<HeapKey>
        {
            public HeapKey(Guid id, Int32 value)
            {
                Id = id;
                Value = value;
            }

            public Guid Id { get; private set; }
            public Int32 Value { get; private set; }

            public int CompareTo(HeapKey other)
            {
                if (_enableCompareCount)
                {
                    ++_compareCount;
                }

                if (other == null)
                {
                    throw new ArgumentNullException("other");
                }

                var result = Value.CompareTo(other.Value);

                return result == 0 ? Id.CompareTo(other.Id) : result;
            }
        }
    }
}
